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A plain clothed Pakistani police officer fires a tear gas canister to disperse protesters, not shown, during clashes in Karachi, Pakistan, Friday, Sept 21, 2012. during clashes that erupted as the demonstrators tried to approach the U.S. embassy in Islamabad, Pakistan, Friday, Sept. 21, 2012. Demonstrations turned violent in several Pakistani cities and over a dozen people were killed as tens of thousands protested against an amateurish anti-Muslim film produced in the United States and vulgar caricatures of the Prophet Muhammad published in a French satirical weekly around the country after the government encouraged peaceful protests and declared a national holiday — "Love for the Prophet Day." (AP Photo/Fareed Khan)

A plain clothed Pakistani police officer fires a tear gas canister to disperse protesters, not shown, during clashes in Karachi, Pakistan, Friday, Sept 21, 2012. during clashes that erupted as the demonstrators tried to approach the U.S. embassy in Islamabad, Pakistan, Friday, Sept. 21, 2012. Demonstrations turned violent in several Pakistani cities and over a dozen people were killed as tens of thousands protested against an amateurish anti-Muslim film produced in the United States and vulgar caricatures of the Prophet Muhammad published in a French satirical weekly around the country after the government encouraged peaceful protests and declared a national holiday — "Love for the Prophet Day." (AP Photo/Fareed Khan)